Add overridable boost_python library name
Add overridable boost_python library name

This would be needed for updating boost to 1.67 or later - the python
bindings libraries changed their names to contain python version they
are built against. Also this naming change is backported to our boost
packages on linux.

matsprea/omim,rokuz/omim,darina/omim,matsprea/omim,mapsme/omim,VladiMihaylenko/omim,mapsme/omim,darina/omim,alexzatsepin/omim,mpimenov/omim,mapsme/omim,milchakov/omim,milchakov/omim,alexzatsepin/omim,alexzatsepin/omim,milchakov/omim,darina/omim,darina/omim,darina/omim,VladiMihaylenko/omim,matsprea/omim,mpimenov/omim,mpimenov/omim,rokuz/omim,alexzatsepin/omim,milchakov/omim,darina/omim,matsprea/omim,mpimenov/omim,mapsme/omim,alexzatsepin/omim,mapsme/omim,matsprea/omim,milchakov/omim,rokuz/omim,mpimenov/omim,alexzatsepin/omim,mapsme/omim,rokuz/omim,milchakov/omim,darina/omim,rokuz/omim,alexzatsepin/omim,rokuz/omim,darina/omim,mpimenov/omim,darina/omim,mpimenov/omim,VladiMihaylenko/omim,matsprea/omim,rokuz/omim,alexzatsepin/omim,mpimenov/omim,alexzatsepin/omim,alexzatsepin/omim,alexzatsepin/omim,VladiMihaylenko/omim,alexzatsepin/omim,VladiMihaylenko/omim,darina/omim,mpimenov/omim,mapsme/omim,mpimenov/omim,mapsme/omim,mpimenov/omim,rokuz/omim,VladiMihaylenko/omim,mpimenov/omim,rokuz/omim,alexzatsepin/omim,rokuz/omim,rokuz/omim,VladiMihaylenko/omim,milchakov/omim,VladiMihaylenko/omim,rokuz/omim,VladiMihaylenko/omim,milchakov/omim,mpimenov/omim,VladiMihaylenko/omim,matsprea/omim,rokuz/omim,mapsme/omim,VladiMihaylenko/omim,mapsme/omim,milchakov/omim,matsprea/omim,mapsme/omim,darina/omim,milchakov/omim,mapsme/omim,darina/omim,milchakov/omim,mapsme/omim,VladiMihaylenko/omim,milchakov/omim,matsprea/omim,milchakov/omim,darina/omim,matsprea/omim,VladiMihaylenko/omim